Koskamo

ListCheckup MCP

An official MCP server provided by ListCheckup that allows AI agents to verify email addresses, check account balances, and manage bulk email list verification tasks using the vendor's REST API infrastructure.

Visit ListCheckup

Endpoint and access

API key: create a key with the vendor first; your client sends it as an authorization header on every request.

ListCheckup MCP logo, by ListCheckupVendor evidenceStreamable HTTPAPI keyEndpoint checked 2026-11-01Operated by ListCheckup
You need:create a key and the two commands below workEvery request carries an API key, created in your dashboardAuthorization: Bearer <key> header
MCP endpoint (Streamable HTTP)
https://listcheckup.com/mcp
Vendor documentation

What you can do with it

  • Verify a single email address for validity and confidence
  • Check remaining API credits and account balance
  • Submit a list of emails to receive a price quote
  • Start a bulk verification process for a submitted list

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.listcheckup/mcp@1.0.0Source repositoryProject website
Maintenance checked

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
825 ms
95th percentile latency
825 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 825 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http listcheckup-mcp https://listcheckup.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).
Codex configuration
codex mcp add listcheckup-mcp --url https://listcheckup.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable listcheckup-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "listcheckup-mcp": {
      "url": "https://listcheckup.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "listcheckup-mcp": {
      "type": "streamableHttp",
      "url": "https://listcheckup.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start listcheckup-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "listcheckup-mcp": {
      "type": "http",
      "url": "https://listcheckup.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.
Gemini CLI configuration
gemini mcp add --transport http listcheckup-mcp https://listcheckup.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.
Claude Desktop configuration
{
  "mcpServers": {
    "listcheckup-mcp": {
      "url": "https://listcheckup.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.
Windsurf configuration
{
  "mcpServers": {
    "listcheckup-mcp": {
      "serverUrl": "https://listcheckup.com/mcp"
    }
  }
}

Let your agent find its tools

Find servers like ListCheckup MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

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Do you run ListCheckup MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

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